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by okenido
Tue Oct 02, 2018 10:08 pm
Forum: Official Foundation Display
Topic: Official 7 inch screen : white flash at startup
Replies: 14
Views: 5147

Re: Official 7 inch screen : white flash at startup

It depends if the people investigating this have access to the source code of RPI firmware and/or the GPU initialization source code. Probably not very hard for the right people, but too hard for the users if it requires to reverse engineer things. Maybe a hacky solution would be to cut the power li...
by okenido
Mon Oct 01, 2018 6:07 pm
Forum: Official Foundation Display
Topic: Official 7 inch screen : white flash at startup
Replies: 14
Views: 5147

Re: Official 7 inch screen : white flash at startup

Oh okay ! Would be nice if someone working on the raspberry pi's firmware could investigate this. Maybe it's due to the screen controller, in that case i'm out of luck. If it's on the GPU side maybe there is something they can do, as this white screen (seems to) serve no purpose.
by okenido
Mon Oct 01, 2018 5:44 pm
Forum: Official Foundation Display
Topic: Official 7 inch screen : white flash at startup
Replies: 14
Views: 5147

Re: Official 7 inch screen : white flash at startup

Because I have a framebuffer that is half the real screen size (800x480 => 400x240) for my custom software renderer. Disabling the interpolation allows for crisp pixels to be rendered, instead of a blurry mess :) But that's not the problem since even with an EMPTY config.txt (that means interpolatio...
by okenido
Mon Oct 01, 2018 2:34 pm
Forum: Official Foundation Display
Topic: Official 7 inch screen : white flash at startup
Replies: 14
Views: 5147

Re: Official 7 inch screen : white flash at startup

The splash screen looks like that because I disabled interpolation in config.txt (normally it's so smoothed it looks like... a rainbow). Setting to default with an empty config.txt doesn't solve the problem.

The white flash still happens with no kernel8-32.img at all, just the boot files.
by okenido
Mon Oct 01, 2018 12:46 pm
Forum: Official Foundation Display
Topic: Official 7 inch screen : white flash at startup
Replies: 14
Views: 5147

Re: Official 7 inch screen : white flash at startup

Sure ! I updated the first post with it ;)
by okenido
Mon Oct 01, 2018 12:24 pm
Forum: Official Foundation Display
Topic: Official 7 inch screen : white flash at startup
Replies: 14
Views: 5147

Official 7 inch screen : white flash at startup

Hello The screen is doing a fast white flash on boot, before the rainbow screen is displayed. RPI model 3 B+ with the official 7 inch screen, last boot files from the git repository. Everything works well but it would look cleaner if it stayed black, especially since I plan to use it integrated in a...
by okenido
Thu Aug 02, 2018 12:12 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread.
Replies: 926
Views: 479315

Re: STICKY: The I2S sound thread.

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